Funny thing is that most offroad drivers complain about the rule while we onroad drivrs have no issue with 16%, Even our older 25% shimmed engines do run fine on 16%. But yes, if you want the most out of it then taking out an 0.1mm shim is the best thing to do. Getting special 16% buttonheads is also an option but with some engines it is not always a direct fit.

And yeas, the EU is talking about 16% by weight and not by volume making it arround 12%